So I mined and got a little, everything good but suddenly since 6/1/13, I left my PC on for 12 hours and gui miner told me I got no shares. I did it again with a diffrent pool (bitcoin pool , the first time it was 50btc) and same thing, is there something wrong with my computer or did something happen to make it really hard to mine.
P.S. I mine at 100mh/s
EDIT:
I have an AMD 6670, I oppened up a game and it said install drivers, so I went and got the newest catalyst version. https://bitcointalk.org/index.php?topic=177855.0 This Link really helped me out, although the error that you get lasts for a fraction of a second and I had to record it and watch the clip to read it.
In this case the problem was AMD CATALYST 13.6 BETA so re install an older version.